Europhys. Lett.
Volume 67, Number 2, July 2004
Page(s) 294 - 300
Section Interdisciplinary physics and related areas of science and technology
Published online 01 July 2004
Europhys. Lett., 67 (2) , pp. 294-300 (2004)
DOI: 10.1209/epl/i2003-10283-y

Composition-dependent optical properties of nanocrystalline mercury telluride

S. Rath and S. N. Sahu

Institute of Physics - Sachivalaya Marg, Bhubaneswar, 751 005, India

(Received 2 September 2003; accepted in final form 7 May 2004)

Mercury telluride ( $\chem{HgTe}$) nanoparticulate thin films have been prepared by an electrochemical route. Rutherford back-scattering measurements reveal the change in $\chem{Hg}$ to $\chem{Te}$ ratio as a function of electrolysis current density. The observation of quantum size effect in an inverted narrow band gap material, $\chem{HgTe}$, with average crystalline size 5.35 $\un{nm}$, has been demonstrated through its transmission electron microscopy, optical absorption, photoluminescence and Raman scattering studies. Unique optical properties of $\chem{HgTe}$ nanocrystals have been observed that are found to depend upon the crystalline size and compositional ratio of $\chem{Hg}$ to $\chem{Te}$ in $\chem{HgTe}$.

78.67.-n - Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures.
81.05.Dz - II-VI semiconductors.
81.15.Pq - Electrodeposition, electroplating.

© EDP Sciences 2004